In 1953, the war began: Martian invaders, bent on the conquest of Earth, destroy human civilisation as we know it, leaving death and panic in their wake. If not for our planet's tiniest bacteria, they would have completely wiped human beings from the face of the planet. Captured and quarantined, the aliens' threat has been all but forgotten. However, now, freed from captivity, they vow not to repeat their mistakes and finish what they started. The only thing standing in their way is a small band of human resistance fighters... Let the battle begin!